Gear pump



"se t.15,1'931. RHA GIS v 1,823,098

GEAR PUMP Filei June 12, 1928 s Sheets-Sheet 1,

IN V EN TOR. 2 4

Sept. 15, 1931. G. R. HARGIS GEAR PUMP Filed June 12, 1928 .3Sheets-Sheet 3 INVENTORQ Geozye ZR $2 419,

ATTORNEY it pumped from 1 pump of my construction,

Patented Sept. 15, 1931 UNITED STATES.

PATENT OFFICE GEORGE HA lS or FREDERICK,

MARYLAND; essreiqoa 1 THE FREDERICK mom a S Q MPANY, E ER K M LAND; ACORP I N E MARY A G AR PUMP.

Application filed; June 12, 1928. Serial No. 284,736,

My invention relates broadly to pumps and more particularly to a compactconstruction. of gear pump for composite mixtures of air and: water.

@ne of the objects. of my invention is to provide a. construction ofgear pump which may be manufactured from a minimum number of parts forpumping composite mixtures of'air and water where the pump is proacross.both chambers for permitting quick access to parts of the pump forrepair and simplifying the mechanical assembly of the 1;. pump.

Another object of my invention is to provide a compact construction ofgear pump having integrally cast suction and discharge chambers with aportion of the chambers cut away to receive a pair of aligned gearsjournaled one above the other centrally of the casting for producingsuction in one chamber and discharging into an adjacent chamber acompact mixture of air and water the suction chamber.

Still another object of my invention is to provide a simplifiedconstruction of gear pump having integrally cast suction anddischargechambers in which there is housed a pair of drive gears in which thesuction and discharge chambers terminate with means connecting oppositesides of the casting for journaling the gears in a central positionwithin the casting.

ther and further objects of my invention reside in the, construction ofthe gear pump described in the following specification and set forth inthe accompanying drawings in which:

Figure 1 is a front view of a gear pump constructed in accordance withmy invent-ion; Fig. 2 is a lateral cross-sectional view taken throughthe gear pump on line 2-2 of Fig. 3; and Fig. 8 is a longitudinalcrosssectional view through the gear pump on line 3-3 of Fig. 1..

Referring to the drawings in detail, reference character 1 designatesthe base of the casting which forms the housing for the dischargechambers,

- one side of the pump the base being mounted upon any suitablefoundation represented at 2, and secured thereon by suitable means suchasbolts, nuts or lag screws indicated at 3. The casting has its bodyportion 4 extending vertically into cast side portions 5 connected byintermediate web portions which terminate in an enlarged cast portion 7in the interior of the casing. The suction chamber is indicated at 45and the discharge chamber at 46. The casting is provided with centrallyextending bores 8 and 9 adjacent its lower extremity. The borev 8 passespar-v tially through the cast portion 7, while the bore, 9 extendspartially through the cast portion t. The suction port. 10 enters theleft hand side of bores 8 and 9, while the discharge port 11 extendsfrom the opposite side of the bores 8 and 9. v The casting 7 is. roundedon oppositesides of the center thereof to provide relatively narrowpassageways to and from the bores 8 and 9. I provide gears, and 21carried by shafts18 ajncl'19 which are journaled in bearings at oppositeends thereof. 1 have shown one journalat formed by a support 22 whichcarries ball races. 23 and: 24: which journal the ends of shafts '18 and1 9. A cover 27 is provided on the end ofthe bearing to which alubricating cup 29: communi-. cates formaintaining the bearings inproper condition at all times. The cover 27 is. se-. cured in positionby suitable screw members 41. The opposite ends of the shafts 18 and 19.are journaled in the ball races. 25. and 26. carrying bracket member 42.The end of shaft 18 is connected through the couplings 31 32 and 3 3with a driven shaft to which is secured the flange me her 32 by whichthe pump may be driven from a suitable prime mover. The bearings and 26are housed within the casing 28 to which lubricant is supplied throughcup 30. The shafts 18 and 19 pass through stuifing boxes 17 formed inflange 34 and to 35 bolted in place by attachment members 36. The topplate 35 abuts at 43 with the upper extremity 44 of partition member 6,thus providing a complete suction chamber 45 and discharge chamber 46.The plate 35 is provided with a central screw threaded aperture 38 and37 located substantially along the center line of each chamber. Pipeline 39 connects to screw threaded portion 38 providing a suction inletto the pump. Pipe line 40 connects through the plate at 37 providing adischarge outlet from the pump. It will be understood that when therotation as shown by the arrows in Fig. 2 is reversed that the suctionand discharge connections are also reversed.

"In order to make necessary repairs on the pump the top plate 35 may beremoved to secure immediate access to the interior of the suction anddischarge chambers. The pump gears are readily removable by with drawingplates 12 and removing the several bearings.

I have found the pump construction of my invention extremely practicaland particularly adapted for the removal of the air core in the centerof a cake of ice when the ice is being frozen. The pump will operateupon a composite mixture of air and water. The positioning of thevertical chamber immediately above the pump gears and integral with thepump case obviates the necessity of priming except on the initial start.The elimination of joints and fittings serves to decrease leakage andincrease the efficiency of the pump. The necessity of the self-primingfeature of the pump becomes apparent when it is considered how the pumpis normally used in practice. In the manufacture of ice where there area numrun. The

her of independent cans of water being frozen a hose is immersed in thecan and the air which is pocketed in the composite mixture of ice andwater is pumped out leaving an ice cake which can be frozensolid.

When the operator moves from one can tothe next the end of the hose maybe thrown upon the floor while the pump continues to pump will stopdischarging a composite mixture of water and air, but due to the factthat a certain amount of water is retained in the priming or suctioncham ber 45 when the suction hose is immersed in the adjacent can ofwater the pump, after a short period, will exhaust the air from the icecore in the same manner as in the previous operation without repriming.

While I have described my invention in a preferred embodiment, I desirethat it be understood that modifications may be made and that nolimitations upon my invention are intended other than are imposed by thescope of the appended claim.

l/Vhat I claim as new and desire to secure said bowl end of said wallabove the bowl shaped bottom portion of said casting and projecting onopposite sides thereof and curved according to the contour of the bowlshaped bottom of said casting for establishing a substantially uniformpassage extending from and leading to said suction and dischargechambers, said enlarged central portion and shaped portion having boresextending therethrough, and cooperating gear devices rotatably mountedin said bores and disposed centrally with respect to said chambers andadapted to perform a pumping operation between said suction anddischarge chambers.

In testimony whereof I aflix my signature.

GEORGE R. HARGIS.

ILJ

